Hi! My fiancé has a vintage Omega Constellation watch, with a vintage brown leather band. Unfortunately, he stopped wearing it because the band was breaking down. I would love to get him a new watchband (or maybe a new watch entirely), but I have no idea of 1) the exact model of the watch (If I need this to find the proper band) and 2) If it is even possible to get a vintage leather band for the watch 3) If it is even advisable to get an old leather band that is likely to break down again.

I am including a picture but only of the front of the watch--I don't know where I could get more information that would help narrow down the model. Any advice on this/the questions above would be very appreciated!